JP2008295039A - System and method for managing communication in hybrid passive optical network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system and method for managing communication in a hybrid passive optical network (HPON). <P>SOLUTION: The system includes steps of: transmitting a first setting message to the HPON at a first wavelength; receiving at receivers of optical line terminals (OLT) receive a setting response message from an ONU among sets of first optical network units (ONU); associating each ONU of the sets of the first ONUs with the receivers; transmitting a second setting message to the HPON at a second wavelength after transmitting the first setting message; receiving at the plural receivers of the OLTs the setting response message from an ONU among the sets of the second ONUs which do not belong to the sets of the first ONUs; and associating each ONU of the sets of the second ONUs to the receivers which receive the setting response message obtained from the second wavelength and the ONU. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a communication system, and more particularly to a communication management system and method in a hybrid passive optical network.

  In recent years, communication network bottlenecks have occurred in what is known as an access network. The bandwidth of long-haul optical networks has increased rapidly with new technologies such as wavelength division multiplexing (WDM) and high bit rate traffic transmission. Metropolitan-area networks are also dramatically increasing in bandwidth. However, the access network, also known as the “last mile” of the communications infrastructure that connects the carrier's central office to the home and operator sites, has yet to increase bandwidth at an affordable price. Thus, at present, the access network has become a bottleneck of communication networks such as the Internet.

  Power-splitting passive optical networks (PSPON) is one solution to this bottleneck problem. PSPON refers to a typical access network in which an optical line terminal (OLT) at a carrier's central office transmits traffic on an optical network unit (ONU) at broadcast (one or more) downstream wavelengths. In the upstream direction, the ONU typically time divisions the transmission of traffic at one wavelength. An ONU is a type of access node that converts an optical signal transmitted over a fiber into an electrical signal that can be transmitted to individual subscribers and vice versa. PSPON solves the bottleneck problem by providing greater bandwidth than a typical access network. For example, a network such as a digital subscriber line (DSL) network carries traffic over a copper telephone line, typically at a rate between about 144 kilobits / second and 1.5 megabytes / second. Transmit with. Conversely, broadband PON (BPON) is an example of PSPON, and is currently deployed and 32 users share a capacity of several hundred megabits / second. Gigabit PON (GPON) is another example of PSPON, generally operating at speeds of up to 2.5 Gigabits / second using more powerful transmitters, providing even greater bandwidth Yes. In addition to this, for example, there are asynchronous transfer mode PON (APON) and Gigabit Ethernet (registered trademark) PON (GEPON).

  Although the bandwidth provided by PSPON systems in access networks is increasing, the demand for larger bandwidth continues to increase. One solution is wavelength division multiplexed PON (WDMPON), which dramatically increases downstream (and upstream) capacity, but is not efficient. WDMPON is an access network in which each ONU transmits and receives traffic at dedicated downstream and upstream wavelengths. WMDPON increases capacity dramatically, but is too costly for many operators and provides capacity that greatly exceeds current and near future demand. As the demand for capacity continues to grow (but in most cases not enough to use WDMPON), there is a need for a cost effective solution that can upgrade from PS-PON to full WDMPON.

  In accordance with the teachings of the present invention, a communication management system and method in a hybrid passive optical network (HPON) is provided. In one embodiment, the method includes transmitting a first setup message to the HPON at a first wavelength. The method also includes the step of the receiver of the optical line terminal (OLT) receiving a configuration response message from the ONU of the first set of optical network units (ONUs). The method receives, in a database, each ONU of the first ONU set from the first wavelength and the setting response message from the ONU based on the configuration response message from the first ONU set. Further comprising associating with the receiver. The method also includes transmitting a second configuration message to the HPON at a second wavelength after transmitting the first configuration message. The method further includes the plurality of receivers of the OLT receiving a configuration response message from an ONU that does not belong to the first set of ONUs among a second set of ONUs. The method is based on the configuration response message from the second set of ONUs, in the database, for each ONU of the second set of ONUs, the configuration response message from the second wavelength and the ONU. Associating with the receiving receiver.

  The technical advantage of the embodiment of the present invention includes that the OLT and the ONU in the HPON can appropriately communicate with each other by using the reachability automatic discovery method in the HPON. For such communication, in some embodiments, the reachability auto-discovery scheme associates a transmission downstream wavelength with an ONU that receives traffic at that wavelength in the OLT. Such an association is made for one wavelength at a time in one embodiment, but simultaneously for all wavelengths in another embodiment. In embodiments that use multiple receivers in the OLT, each receiver may be associated with a corresponding set of ONUs that send upstream traffic to that receiver. In some embodiments, the OLT uses an association between transmitter, ONU, and receiver to generate and send an upstream bandwidth allocation map to the ONU.

  In some embodiments, automatic discovery used in HPON provides an efficient way to determine reachability. When upgrading from PSPON to HPON, an efficient automatic discovery scheme will not be significantly different from a PSPON messaging scheme that improves functionality. An efficient auto-discovery scheme also generally does not require significant changes to the PSPON components or the PSPON architecture. As an example, in the function improvement from GPON to HGPON, an efficient method for automatic discovery of ONU reachability is G.264. Those that are not significantly different from the 984.3 GPON protocol and / or that do not require changes to the ONU hardware.

  It will be appreciated that various embodiments of the invention may include some, all, or none of the listed technical advantages. In addition, other technical advantages of the present invention will be readily apparent to one of ordinary skill in the art based on the drawings, detailed description, and claims.

  For a better understanding of the present invention and its features and advantages, the following description is made with reference to the accompanying drawings.

  FIG. 1 is a diagram illustrating an example of a power splitting passive optical network (PSPON) 10. In general, PSPON is used to solve a communication network bottleneck in a network part known as an access network. In recent years, the bandwidth of long-haul optical networks has increased rapidly due to new technologies such as wavelength division multiplexing (WDM) and traffic transmission at high bit rates. In addition, the bandwidth of metropolitan-area networks has increased dramatically. However, the access network, also known as the “last mile” of the communications infrastructure that connects the carrier's central office to the home and operator sites, has yet to increase bandwidth at an affordable price. Thus, at present, the access network has become a bottleneck of communication networks such as the Internet.

  PSPON solves the bottleneck problem by providing greater bandwidth than a typical access network. For example, a network such as a Digital Subscriber Line (DSL) network carries traffic over a copper telephone line, typically at a rate between about 144 kilobits / second and 1.5 megabits / second. Transmit with. In contrast, the currently used broadband PON (BPON) offers a capacity of several hundred megabits / second and is shared by 32 users. Gigabit PON (GPON) typically operates at speeds up to 2.5 gigabits per second using more powerful transmitters and provides even greater bandwidth.

  1 again, the PSPON 10 includes an optical line terminal (OLT) 12, an optical fiber 30, a remote node (RN) 40, and an optical network unit (ONU) 50. PSPON 10 refers to a typical access network that transmits traffic at one or two downstream wavelengths that an optical line terminal (OLT) at a central office of a carrier broadcasts to an optical network unit (ONU). The PSPON 10 is, for example, an asynchronous transfer mode PON (APON), BPON, GPON, Gigabit Ethernet (registered trademark) PON (GEPON), or other suitable PSPON. A feature common to all PSPONs 10 is that the outside fiber plant is completely passive. The downstream signal transmitted by the OLT is passively distributed by the RN and goes to the downstream ONU coupled to the RN via a branch of fiber. Each ONU is coupled to the end of one branch. The upstream signal transmitted by the ONU is also passively transferred by the RN and goes to the OLT.

  The OLT 12 is an example of an upstream terminal, but may be in a carrier central station and coupled to a larger communication network. The OLT 12 includes a transmitter 14 that broadcasts traffic to all ONUs 50 at a downstream wavelength, such as λd. The ONU 50 is at or near customer sites. The OLT 12 includes a second transmitter 20 that broadcasts traffic to all ONUs 50 at a second downstream wavelength λv (in addition to λd). As an example, in a typical GPON, λv carries analog video traffic. Alternatively, λv may carry digital data traffic. The OLT 12 also includes a receiver 18 that receives traffic from all ONUs 50 at a time-division upstream wavelength λu. The OLT 12 also includes filters 16 and 22 that pass and reflect wavelengths as appropriate.

  It should be noted that in a typical PSPON, λd and λv downstream traffic is transmitted at a higher bit rate than λu traffic, and the bandwidth of PSPON is smaller in the upstream than in the downstream. is there. Also, downstream transmitters are generally more powerful than upstream transmitters, and downstream reach is longer than upstream reach. Also, “downstream” traffic refers to traffic going from the OLT (or upstream terminal) to the ONU (or downstream terminal), and “upstream” traffic is from the ONU (or downstream terminal) to the OLT (or upstream terminal). It should also be noted that it refers to traffic going in the direction. It should be further noted that in a specific PSPON, for example, λd includes a band centered at 1490 nm, λv includes a band centered at 1550 nm, and λu includes a band centered at 1311 nm. .

  The optical fiber 30 may include any suitable fiber that carries upstream and downstream traffic. In a certain PSPON 10, the optical fiber 30 includes, for example, a bidirectional optical fiber. In other PSPONs 10, the optical fiber 30 includes two different fibers.

  The RN 40 (also generally referred to as a distribution node) of the PSPON 10 includes any suitable power splitter such as an optical coupler and connects the OLT 12 to the ONU 50. The RN 40 is placed in any suitable location and splits the downstream signal so that each ONU 50 receives a copy of the downstream signal. Due to splits and other possible power losses, the power of each copy sent to the ONU is less than 1 / N of the downstream signal power received by the RN 40. Here, N is the number of ONUs 50. In addition to the branching of the downstream signal, the RN 40 also has a function of combining time-shared signals transmitted by the ONU 50 into a single upstream signal. The RN 40 transfers the upstream signal to the OLT 12.

  The ONU 50 (which is an example of a downstream terminal) includes any suitable optical network unit or optical network terminal (ONT) and generally transmits optical signals transmitted over fiber to individual subscribers. Or vice versa, it refers to an access node that converts electrical signals that can be transmitted. Subscribers include residential customers and commercial customers. Generally, the PON 10 has 32 ONUs 50 per OLT 12, and therefore, in many cases, the PON will be described as including this number of ONUs. However, any number of ONUs may be provided per OLT. The ONU 50 includes triplexers having two receivers that receive downstream traffic (one is λd traffic and the other is λv traffic) and one transmitter that transmits λu upstream traffic. May be included. In general, the transmission rate of the ONU transmitter is lower than the transmission rate of the OLT (since the demand for upstream capacity is less than the demand for downstream capacity). In general, the power of the ONU transmitter is weaker than that of the OLT transmitter, and the upstream reach is shorter than the downstream reach. Each ONU 50 processes the specified downstream traffic and (in order to prevent traffic transmitted by one ONU at λu from colliding with traffic transmitted by other ONUs at λu) by an appropriate time division protocol. Send.

  In operation, the transmitter 14 of the OLT 12 broadcasts download traffic to the ONU 50 at λd. The transmitter 20 of the OLT 12 may broadcast downstream analog video traffic to the ONU 50 at λv. λd traffic passes through filter 16 and is combined with λv by filter 22 (passing λd and reflecting λv). The combined traffic travels through the optical fiber 30 to the RN 40. The RN 40 branches downstream traffic into a suitable number of copies and sends each copy to the corresponding ONU 50. Each ONU 50 receives a copy of the downstream traffic at λd and λv and processes the signal. Identify which traffic is destined for which ONU 50 using suitable addressing schemes.

  In the upstream direction, each ONU 50 may transmit upstream traffic over fiber 30 at λu by a suitable time division protocol (so that upstream traffic does not collide). The RN 40 receives upstream traffic from each ONU 50 and combines the traffic from each ONU 50 (eg, at the RN's power splitter) into one signal. The RN 40 then sends the combined signal to the OLT 12 over the fiber 30. In the OLT 12, combined traffic passes through the filter 22 and is reflected by the filter 16 to the receiver 18. Receiver 18 receives and processes the signal.

  The current limitation of typical PSPONs is that the upstream bandwidth is limited. In a hybrid PON (HPON) that is a hybrid of PSPON and WDMPON and transmits a plurality of upstream wavelengths, the upstream bandwidth can be increased. FIG. 2 shows an example of an HPON, and FIG. 3 shows an example of an HPON that transmits a plurality of upstream wavelengths.

  FIG. 2 is a diagram illustrating an example of the HPON 500. An example HPON 500 includes an OLT 512, an optical fiber 530, an RN 540, and an ONU 550. HPON 500 provides greater downstream capacity than PSPON by allowing multiple groups of two or more ONUs 550 to share downstream WDM wavelengths. It should be noted that HPON is not a full WDMPON, but refers to any suitable PON that can route downstream traffic to an ONU at a certain wavelength (which can send upstream traffic in any suitable way). is there. HPON transmits downstream traffic at multiple wavelengths, each wavelength is downstream with a unique wavelength for each ONU, with HPON being shared by a group of ONUs sharing the wavelength (WS-HPON illustrated) Both HPPONs that transmit traffic (but with PSPON characteristics in the upstream direction) may be included.

  The OLT 512 (which is an example of an upstream terminal) is at the central station of the carrier and includes a transmitter 514, a multiplexer 515, a filter 516, a receiver 518, a transmitter 520, and a filter 522. Each transmitter 514a-514d has any suitable transmitter and transmits traffic at a corresponding wavelength λ1-λ4.

  It should be noted that the use of λ1-λ4 in HPON 500 is for illustrative purposes only. Moreover, although the illustrated HPON 500 includes four transmitters, any appropriate number of transmitters may be provided to transmit traffic at any appropriate number of wavelengths. Although the illustrated HPON 500 does not use WDM for upstream traffic, it is economical to have a transceiver (transmitter and receiver) in the OLT 512 in addition to the transmitter 514 in anticipation of future upgrades to WDM upstream. It should be noted.

  Multiplexer 515 is any suitable multiplexer / demultiplexer (which may be thought of as a wavelength router) and can combine λ1-λ4 traffic into a single signal. In some networks, the multiplexer 515 may be a cyclic multiplexer that receives and combines traffic at one or more wavelengths by each port. In other networks, the multiplexer 512 may be a typical N × 1 multiplexer that receives only one wavelength of traffic by each port.

  Filter 516 may be any suitable filter that receives λ1-λ4 traffic from multiplexer 515 and passes the λ1-λ4 traffic to filter 522. In the upstream direction, filter 516 receives λu traffic and sends the λu traffic to receiver 518. Receiver 518 is any suitable receiver that receives and processes upstream traffic from ONU 550 carried in a time-shared λu.

  Transmitter 520 is any suitable transmitter and transmits traffic at λv for eventual broadcast to all ONUs 550. Transmitter 520 can also direct the traffic to filter 522. In some embodiments, transmitter 520 transmits analog video traffic at λv. In another embodiment, transmitter 520 may transmit digital data traffic. Although only one transmitter 520 is shown, it should be noted that the OLT 512 may have any number of transmitters that ultimately broadcast traffic to all ONUs 550.

  The filter 522 receives λv traffic and λ1-λ4 traffic and combines them. Filter 522 sends the combined traffic to RN 540 via fiber 530. In the upstream direction, filter 522 receives λu traffic and sends the λu traffic to filter 516.

  Optical fiber 530 may be any suitable fiber that carries upstream and downstream traffic. In a certain HPON 500, the optical fiber 530 is, for example, a bidirectional optical fiber. In other HPONs 500, the optical fiber 530 is two different fibers, one carrying downstream traffic and the other carrying upstream traffic.

  The RN 540 includes a filter 542, a multiplexer 546, a main power splitter 548, and a sub power splitter 549. The RN 540 receives the λ1-λ4 and λv traffic from the OLT 512, filters and broadcasts the λv traffic, demultiplexes the λ1-λ4 traffic, and in the corresponding group of wavelength sharing ONUs 550. To ONU. The RN 540 receives upstream signals carried by the time-division wavelength λu from the ONU 550, combines these signals, and sends the combined λu traffic to the OLT 512. Although RN 540 is referred to as a remote node, it should be noted that “remote” means that RN 540 is communicatively coupled to OLT 512 and ONU 550 in any suitable spatial arrangement. . The remote node is generally called a distribution node.

  Filter 542 is any suitable filter that receives signals including λ 1 -λ 4 and λ v traffic, passes the λ 1 -λ 4 traffic through multiplexer 546, and sends the λ v traffic to main power splitter 548. The exemplary filter 542 includes only one filter, but may be any suitable number of filters (combined with an optical switch) to facilitate network upgrades. In the upstream direction, filter 542 receives λu traffic and directs it to OLT 512 (direct).

  Multiplexer 546 may be any suitable multiplexer / demultiplexer (which may be considered a wavelength router) and may receive a signal containing λ1-λ4 traffic and demultiplex the signal. Each output port of the multiplexer 546 sends one corresponding λ1-λ4 traffic to the corresponding secondary power splitter 549a-549d. In the upstream direction, the ONU 550 of the illustrated HPON 500 time-shares λu (rather than transmitting traffic over multiple upstream wavelengths), so the multiplexer 546 receives λu traffic and terminates it. (Terminate). Alternatively, multiplexer 546 may forward this traffic to filter 542 and terminate it appropriately (termination may be done internally or externally).

  It should be noted that multiplexer 546 includes any suitable number of ports, including a cyclic multiplexer or any other suitable type of multiplexer. Also, although one multiplexer 546 is shown in the remote node 540 of FIG. 2, in another remote node, the multiplexer 546 includes two or more separate multiplexers, each of which is an upstream signal (one or more). A downstream signal from the source may be received, the traffic forwarded downstream, and the ONU 550 may share the wavelength. It should also be noted that traffic at each wavelength may pass through a different secondary power splitter than illustrated, traffic at two or more wavelengths may pass through the secondary power splitter, and multiplexers 546 are 4 One or more or less of the downstream wavelength traffic may be received, multiplexed and passed.

  The main power splitter 548 includes any suitable power splitter that receives λv traffic and branches it as four copies. The power of each copy is ¼ or less of the power of the original signal λv. The main power splitter 548 sends each copy to the corresponding secondary power splitter 549. In the upstream direction, the main power splitter 548 receives traffic transmitted from the ONU 550 via the time-divided λu from the secondary power splitter 549 and combines the traffic into one signal. Main power splitter 548 forwards the upstream signal to OLT 512. Thus, the main power splitter 548 broadcasts λv traffic in the downstream direction and combines the λu traffic time-divided in the upstream direction. Although the main power splitter 548 is illustrated as a 1 × 4 power splitter, any suitable power splitter can be used.

  Each secondary power splitter 549 includes an optical coupler or any other suitable power splitter, receives the signal from the main power splitter 548 and the signal from the multiplexer 546, combines the two signals into one signal, and combines Branch the signal into an appropriate number of copies and send each copy to the ONUs in the corresponding group of ONUs 550 sharing the wavelength. In the upstream direction, each secondary power splitter 549 receives traffic transmitted from each ONU 550 in the corresponding ONU 550 group at λu and combines the traffic from each ONU 550 into one signal. Each secondary power splitter 549 branches the combined upstream traffic into two copies and forwards one copy to the main power splitter 548 and the other copy to the multiplexer 546. The copy forwarded to the main power splitter 548 is combined with traffic from other ONUs 550 transmitted in a time-shared λu as described above. The copy forwarded to multiplexer 546 is either blocked or sent to filter 542 for proper termination. In the illustrated HPON 500, the secondary power splitter 549 is illustrated as a 2 × 4 coupler, but may be any suitable coupler, such as a combination of couplers (eg, a 2 × 2 coupler coupled to two 1 × 2 couplers). But you can. The number of signals that the secondary power splitter 549 branches or combines may be any suitable number.

  Each ONU 550 (although an example of a downstream terminal) includes any suitable ONU or ONT. Each ONU 550 includes a filter 560, a receiver 562, a filter 570, a receiver 572, and a transmitter 582. Each filter 560 includes any suitable filter that sends traffic of wavelength λv (eg, analog video traffic) to receiver 562. The filter 560 sends the traffic of the corresponding wavelength of λ1 to λ4 received by the ONU 550 to the filter 570, and passes the traffic of λu to the RN 540 in the upstream direction. The receiver 562 includes any suitable receiver that receives traffic transmitted at λv and processes the traffic. Each filter 570 includes any suitable filter that receives traffic of the corresponding wavelength of λ 1 -λ 4 and sends it to the receiver 572. The filter 570 further passes the upstream wavelength λu traffic to the corresponding filter 560 in the upstream direction. Receiver 572 includes any suitable receiver that receives traffic transmitted at a corresponding wavelength of λ1-λ4 and processes the traffic. Since the receiver 572 receives traffic of any wavelength of λ1 to λ4, the ONU 550 can be flexibly assigned (or reassigned) to the wavelength sharing group. Each transmitter 582 includes any suitable transmitter that transmits traffic at λu in the upstream direction, using a suitable protocol to time share other ONUs 550 and λu.

  It should be noted that although four ONUs 550 are illustrated as part of a group of ONUs in HPON 500, there can be any number of ONUs 550 that are part of a group sharing a downstream wavelength. There may also be a plurality of groups, each sharing a different downstream wavelength. For example, ONU 550a may share λ1, ONU 550b (not shown) may share λ2, ONU 550c (not shown) may share λ3, and ONU 550d may share λ4. Further, depending on the network, the ONU 550 may be included in two or more groups. Note that there can be any number of ONUs 550 in the network.

  In operation, OLT 512 transmitters 514a-514d transmit traffic on λ1-λ4, respectively, and send the traffic to multiplexer 515. Multiplexer 515 combines the four wavelengths of traffic into one signal and sends the signal to filter 516. Filter 516 passes the downstream signal through filter 522. The transmitter 520 of the OLT 512 transmits traffic at λv and sends the traffic to the filter 522. Filter 522 receives traffic of λ1-λ4 and λv and sends the traffic to RN 540 via optical fiber 530.

  The filter 542 of the RN 540 receives the signal, sends the λv traffic to the main power splitter 548 and passes the λ1-λ4 traffic to the multiplexer 546. The main power splitter 548 receives λv traffic and branches it into the appropriate number of copies. In the illustrated embodiment, the primary power splitter 548 splits the traffic at λv into 4 copies and forwards each copy to the corresponding secondary power splitter 549. Multiplexer 546 receives a signal containing traffic of λ1-λ4 and demultiplexes the signal to its constituent wavelengths. Multiplexer 546 routes traffic at each wavelength over the corresponding fiber so that each secondary power splitter 549 receives its traffic at the corresponding wavelength of λ1-λ4.

  Thus, each secondary power splitter 549 receives a copy of λv traffic from the primary power splitter 548, receives traffic of the corresponding wavelength from λ1-λ4 from multiplexer 546, and combines these traffics into a single signal. And branch the signal to an appropriate number of copies. In the illustrated embodiment, each secondary power splitter 549 splits the signal into four copies. In this way, traffic of wavelength λv is broadcast to all ONUs 550, and the corresponding wavelengths of λ1-λ4 are transmitted to one or more groups of ONUs 550 and shared. In the illustrated embodiment, ONU 550a shares λ1, ONU 550b (not shown) shares λ2, ONU 550c (not shown) shares λ3, and ONU 550d shares λ4. The group of ONUs 550 sharing a wavelength may be different from that shown in FIG. 2, and in another network, a group of ONUs 550 sharing a wavelength may share two or more WDM wavelengths. It should be noted that it is good.

  The secondary power splitter 549 branches the signal including the traffic of the corresponding wavelength of λ1 to λ4 and the traffic of λv into four copies, and then the ONU 550 coupled to the secondary power splitter 549 receives the copy. Each copy is transferred over fiber 530. Each ONU 550 filter 560 receives the signal and sends λv traffic to the receiver 562. The receiver 562 processes the traffic carried by λv. Filter 560 passes the corresponding wavelength of λ1-λ4 through filter 570. Filter 570 receives traffic of the corresponding wavelength of λ 1 -λ 4 and sends the traffic to receiver 572. Receiver 572 processes the traffic. Again, since each ONU 550 in the group shares one wavelength of λ1-λ4 with the other ONUs 550 in the group, the ONU 550 applies the appropriate addressing protocol to downstream traffic. (E.g., determine which portion of traffic transmitted at the corresponding wavelength is addressed to which ONU 550 in the group).

  In the upstream direction, the transmitter 582 of each ONU 550 transmits traffic at λu. Filters 570 and 560 receive λu traffic and pass it through. The signal travels through fiber 530 to RN 540. Each secondary power splitter 549 of RN 540 receives traffic via time-shared λu and combines the traffic from each ONU 550 in the corresponding group of ONUs 550. Again, since each ONU 550 transmits traffic via the upstream wavelength λu, the ONU 550 uses an appropriate protocol that time-divides λu so that traffic from multiple ONUs 550 does not collide. Each secondary power splitter 549 receives and combines the traffic of λu into a single signal, then splits the signal into two copies, sends one copy to multiplexer 546 and the other copy to the main power. Send to splitter 548. As described above, the multiplexer 546 of the illustrated network 500 blocks λu or forwards λu to the filter 542 for proper termination. The main power splitter 548 receives the λu traffic from each sub power splitter 549, combines the traffic and forwards it to the filter 542. Filter 542 receives the combined λu traffic and directs the traffic to OLT 512. Fiber 530 sends λu traffic to OLT 512 filter 522. Filter 522 receives the traffic at λu and passes the traffic through filter 516. The filter 516 receives the traffic of λu and sends the traffic to the receiver 518 (direct). Receiver 518 receives the traffic and processes it.

  FIG. 3 is a diagram illustrating an example of the HPON 600 that transmits a plurality of upstream wavelengths. The HPON 600 includes an OLT 612, a fiber 530, an RN 640, and an ONU 650. The ONU 650 can increase the upstream bandwidth by time-division transmitting upstream traffic having a plurality of wavelengths λ5 to λ8. The RN 640 routes this traffic with the main power splitter 648 (or with the multiplexer of the RN 640 in another embodiment). The OLT 612 demultiplexes λ5 to λ8 by the demultiplexer 618, and receives the traffic of λ5 to λ8 by the receivers 619a to 619d, respectively.

  The OLT 612 (which is an example of an upstream terminal) is at the central station of the carrier and includes a transmitter 514, a multiplexer 515, a transmitter 520, a filter 616, a demultiplexer 618, receivers 619a-619d, and a filter 622. The transmitter 514, multiplexer 515, and transmitter 520 have been described with reference to FIG. 2 and will not be described again. It should be noted that in some embodiments, the OLT 612 may include any suitable amplifier (not shown) that extends the reach of downstream traffic.

  Demultiplexer 618 includes any suitable multiplexer / demultiplexer (which may be a wavelength router) and demultiplexes the signal containing λ5-λ8 into its constituent wavelengths. Each receiver 619a-619d includes any suitable receiver that receives traffic of a corresponding wavelength of [lambda] 5- [lambda] 8. In some embodiments, ONU 650 of ONUs 650a-650d can transmit upstream traffic at λ5-λ8 in the same time slot. This upstream traffic is multiplexed by the main power splitter 648 of the RN 640. This point will be described in more detail later. In such an embodiment, demultiplexer 618 demultiplexes λ5-λ8 and sends traffic for each wavelength to the corresponding one of receivers 619a-619d.

  2 and / or 3, λ5-λ8 may be the same as λ1-λ4 transmitted in the downstream direction (not necessarily the same). It should be noted that in some embodiments, receiver 619 and transmitter 514 may be part of a transceiver, and the illustrated PON architecture may be modified to support such a configuration in any suitable manner. . In some embodiments, receiver 619 includes a spectrally wide receiver that is non-discriminating. Also, depending on the embodiment, any number of upstream wavelengths may be transmitted, eg, one upstream wavelength for each ONU 650 (and the HPON 600 may be modified as appropriate to support such transmissions). You may).

  Filter 616 receives traffic from λ 1 -λ 4 from multiplexer 515 and sends the traffic to filter 622. In the upstream direction, filter 616 receives traffic with wavelengths λ 5 -λ 8 from filter 622 and sends the traffic to demultiplexer 618. Filter 622 receives the λ1-λ4 traffic from filter 616 and the λv traffic from transmitter 520, combines the traffic and sends the traffic to RN 640. In the upstream direction, filter 622 receives traffic with wavelengths λ 5 -λ 8 from RN 640 and sends the traffic to filter 616. The optical fiber 530 has been described above with reference to FIG. 2 and will not be described here.

  The RN 640 includes a filter 642, a multiplexer 646, a main power splitter 648, and sub power splitters 649a to 649d. The RN 640 receives the λ1-λ4 and λv traffic from the OLT 612, filters out the λv traffic, broadcasts it, demultiplexes the λ1-λ4 traffic, and shares the wavelength with the ONU 650a- Send to each ONU in the corresponding group at 650d. In the upstream direction, RN 640 receives λ5-λ8 traffic from ONUs 650 a-650 d at main power splitter 648 and sends this traffic to OLT 612. Although RN 640 is referred to as a remote node, it should be noted that “remote” means that RN 640 is communicatively coupled to OLT 612 and ONU 650 in any suitable spatial arrangement. . The remote node is generally called a distribution node.

  Filter 642 includes any suitable filter that receives signals including λ1-λ4 and λv traffic from OLT 612, sends λ1-λ4 traffic to multiplexer 646, and sends λv traffic to main power splitter 648. In the upstream direction, the filter 642 receives λ5-λ8 traffic from the main power splitter 648 (and optionally from the multiplexer 646) and sends the λ5-λ8 traffic to the OLT 612 (also from the multiplexer 646). Properly terminate traffic internally or externally). In the illustrated embodiment, filter 642 includes only one filter, but includes any suitable number of filters (combined with an optical switch) to facilitate network upgrades (eg, capacity upgrades). May be.

  Multiplexer 646 may have any suitable multiplexer / demultiplexer (which may be considered a wavelength router) to receive a downstream signal containing traffic from λ1-λ4 and demultiplex the signal. Each output port of the multiplexer 646 sends one corresponding traffic of λ1-λ4 to the corresponding secondary power splitters 649a-649d, respectively. In the upstream direction, multiplexer 646 receives λ5-λ8 traffic from secondary power splitters 649a-649d and terminates this traffic (or sends this traffic to filter 642 for proper termination).

  It should be noted that the multiplexer 646 includes any suitable number of ports, including a cyclic multiplexer or any other suitable type of multiplexer. Also, although one multiplexer 646 is shown for the remote node 640, in another remote node, the multiplexer 646 is each down from one or more upstream signal sources so that the ONU 650 shares the wavelength. It may include two or more separate multiplexers that receive the stream signal and forward the traffic downstream. It should be further noted that traffic at each wavelength may pass through a different secondary power splitter than illustrated, traffic at two or more wavelengths may pass through the secondary power splitter, and multiplexers 646 are 4 One or more or less downstream wavelength traffic may be received, multiplexed and passed. In some embodiments, multiplexer 646 may be the same as multiplexer 546 of FIG.

  Primary power splitter 648 includes any suitable power splitter that receives λv traffic from filter 642 and splits the traffic into four copies. The power of each copy is ¼ or less of the power of the original signal λv. The main power splitter 648 sends each copy to the corresponding secondary power splitter 649. In the upstream direction, the main power splitter 648 receives the traffic transmitted by the ONU 650 via the time-divided λu from the secondary power splitter 649 and combines this traffic into one signal, which is then sent to the filter 642. send. In this way, the main power splitter 648 broadcasts the downstream traffic of λv and combines and forwards the upstream traffic of λ5-λ8. Since the main power splitter 648 (not the multiplexer) combines the upstream traffic of λ5-λ8, each ONU in the set 650a-650d can transmit at any wavelength of λ5-λ8. Thus, in some embodiments, ONUs that share downstream wavelengths (eg, ONU 650a) transmit at different upstream wavelengths (eg, two or more of λ5-λ8). In another embodiment, these ONUs transmit at the same upstream wavelength (eg, λ5). In another embodiment, main power splitter 648 is illustrated as a 1 × 4 power splitter, but any suitable power splitter can be used.

Each secondary power splitter 649a-649d may include an optical coupler or other suitable power splitter, corresponding to a copy of λv downstream traffic from the main power splitter 648 or λ1-λ4 from the multiplexer 646. Receives wavelength traffic, combines λv and λ1-λ4 traffic, branches the combined traffic into an appropriate number of copies, and forwards each copy to a corresponding set of ONUs 650. In the upstream direction, each secondary power splitter 649 receives traffic having a wavelength of λ5-λ8 from each downstream ONU 650 and combines the traffic into one signal. Each secondary power splitter 649 splits the combined upstream traffic into two copies, forwards one copy to the main power splitter 648 and forwards the other copy to the multiplexer 646. The copy transferred to the main power splitter 648 is combined with the traffic from the other sub power splitter 649 in the splitter 648 and transferred to the filter 642. The copy forwarded to multiplexer 646 is terminated or sent to filter 642 for termination. In the illustrated embodiment, the secondary power splitter 649 includes a 2 × 4 coupler, but in another embodiment, the secondary power splitter 649 includes other suitable couplers or combinations thereof. The secondary power splitter 649 may branch to or combine any suitable number of signals and may be at any suitable location in the HPON 600.
Each ONU 650 (although an example of a downstream terminal) includes any suitable ONU or ONT. Each ONU 650 includes receivers 562 and 572, filters 660 and 670, and transmitter 682. Optical fibers 562 and 572 have been described above with reference to FIG. 2 and will not be described here. Each filter 660 includes any suitable filter that sends λv downstream traffic to receiver 562. The filter 660 passes the traffic having the corresponding wavelength of λ1 to λ4 to the filter 670. In the upstream direction, each filter 660 receives traffic from λ5-λ8 corresponding wavelengths from the corresponding filter 670 and sends the traffic to the RN 640.

  Each filter 670 includes any suitable filter that receives traffic from the corresponding filter 660 at the corresponding wavelength of λ 1 -λ 4 and sends the traffic to the corresponding receiver 572. In the upstream direction, each filter 670 further receives traffic of the corresponding wavelength of λ 5 -λ 8 from the corresponding transmitter 682 and sends the traffic to the corresponding filter 660.

  Each transmitter 682 may include any suitable transmitter that transmits traffic at a corresponding wavelength of λ5-λ8 in the upstream direction. An ONU 650 transmitting at λ5 shares time transmission at λ5, an ONU 650 transmitting at λ6 (not shown) shares time transmission at λ6, and an ONU 650 transmitting at λ7 (not shown) shares time transmission at λ7. The ONU transmitting at λ8 shares the transmission at λ8 with time. It should be noted that the number of ONUs 650 included in the group sharing the upstream wavelength is arbitrary. It should also be noted that there can be any number of ONUs 650 in the network.

  In operation, in the downstream direction, transmitters 514a-514d and 520 of OLT 612 transmit traffic on λ1-λ4 and λv, respectively. Multiplexer 515 combines the λ1-λ4 traffic and forwards the combined traffic to filter 616. Filter 616 receives traffic λ 1 -λ 4 and forwards the traffic to filter 622. Filter 622 receives the λ1-λ4 traffic from filter 616 and the λv traffic from transmitter 520, combines the traffic into one signal and forwards the signal to RN 640 via fiber 530. The filter 642 of the RN 640 receives the λ1-λ4 and λv traffic, sends the λv traffic to the main power splitter 648, and sends the λ1-λ4 traffic to the multiplexer 646. The main power splitter 648 receives the traffic of λv and branches it into the appropriate number of copies. In the illustrated embodiment, the primary power splitter 648 splits the traffic at λv into 4 copies and forwards each copy to the corresponding secondary power splitter 649. Multiplexer 646 receives the signal containing λ1-λ4 traffic and demultiplexes the signal to its constituent wavelengths. The multiplexer 646 sends the traffic of λ1-λ4 to the sub power splitters 649a-649d, respectively.

  Each secondary power splitter 649 receives a copy of [lambda] v traffic from the main power splitter 648 and a corresponding wavelength traffic of [lambda] 1- [lambda] 4 from the multiplexer 646, combines these traffics into a single signal, and branches the signal To the appropriate number of copies and forward each copy to the downstream ONU 650. In the illustrated embodiment, each secondary power splitter 649 splits the signal into four copies and forwards the four copies to the downstream ONU 650.

  In this way, the traffic of wavelength λv is broadcast to all ONUs 650, and the corresponding wavelength of λ1-λ4 is transmitted to the group of ONUs 650 and shared. In the illustrated embodiment, ONU 650a shares λ1, ONU 650b (not shown) shares λ2, ONU 650c (not shown) shares λ3, and ONU 650d shares λ4. In another embodiment, the group of ONUs 650 sharing one wavelength may be different from that shown in FIG. 3, and the group of ONUs 650 sharing a wavelength may share two or more WDM wavelengths. It should be noted that it may be.

  Each ONU 650 filter 660 receives a copy of λv traffic and λ1-λ4 corresponding traffic from the corresponding secondary power splitter 649. The filter 660 sends the traffic of λv to the receiver 562 (which processes the traffic) and sends the traffic of the corresponding wavelength of λ1-λ4 to the filter 670. Filter 670 receives traffic of the corresponding wavelength of λ 1 -λ 4 and sends the traffic to receiver 572. Receiver 572 processes the traffic. Again, since each ONU 650 in the group shares one wavelength of λ1-λ4 with the other ONUs 650 in the group, the ONU 650 applies the appropriate addressing protocol to downstream traffic. (E.g., determine which portion of traffic transmitted at the corresponding wavelength is addressed to which ONU 650 in the group).

  In the upstream direction, each ONU 650 shares the transmission with the corresponding wavelength of λ5-λ8 in time. In some embodiments, a plurality of ONUs 650 transmit traffic of two or more wavelengths of λ5 to λ8 in one time slot. Each secondary power splitter 649 receives any corresponding upstream traffic, splits the received traffic into two copies, forwards one copy to multiplexer 646, and forwards the other copy to main power splitter 648. . Multiplexer 646 terminates the received traffic (or forwards the traffic to filter 642 for termination). The primary power splitter 648 receives a copy of the traffic of λ5-λ8 from the secondary power splitter 649 (if traffic of multiple wavelengths of λ5-λ8 is transmitted in one time slot) into a single signal. Combine and forward the traffic to filter 642. Filter 642 receives the λ5-λ8 traffic from main power splitter 648 and forwards the traffic to OLT 612 (and optionally terminates any traffic from multiplexer 646).

  The OLT 612 filter 622 receives the λ 5 -λ 8 traffic and sends the traffic to the filter 616. Filter 616 receives traffic of two or more wavelengths and forwards the traffic to demultiplexer 618. Demultiplexer 618 demultiplexes the wavelengths and forwards traffic for each wavelength to a corresponding receiver 619. Each receiver 619 receives the corresponding traffic and processes it.

  Modifications, additions, or deletions may be made to the exemplary systems and methods described above without departing from the scope of the present invention. The components of the exemplary methods and systems described above may be integrated or separated according to specific needs. Further, the number of components that perform the operations of the above illustrated methods and systems may be greater or lesser and may be performed by other components.

  When improving the function to HPON that transmits at a plurality of upstream wavelengths, the network operator may need to improve the legacy message transmission method in order to improve the function to the HPON architecture. For example, unlike PSPON, in HPON transmitting at multiple upstream wavelengths, the OLT assigns downstream wavelengths to one or more ONUs and receives upstream traffic from a specific ONU at a specific receiver. As explained in more detail below, under such conditions, the PSPON messaging scheme includes discovery, ranging, upstream bandwidth allocation, and routing of upstream and downstream traffic. There is a risk that it cannot be performed correctly. Thus, the function improvement from the PSPON message system is required.

  Network operators also want an efficient solution for improving legacy messaging. For example, the efficient message system does not change much from the PSPON message system for improving the function, and the software and hardware are less modified. In addition, an efficient message system does not require significant changes to network components. As an example, in the function improvement from GPON to HGPON, an efficient message method for automatic discovery of ONU reachability is G.264. Those that are not significantly different from the 984.3 GPON protocol and / or that do not require changes to the ONU hardware. For example, in other cases where the function of POPON is improved, such as the function improvement from BPON or GEPON, an analog automatic discovery method is also efficient.

  Typically, the GPON ONU is an ITU-T G. Installed and activated by the GPON protocol known as the 984.3 protocol. This protocol is an ONU management control channel (OMCC) that uses automatic discovery and ranging of ONUs in the network and physical layer operations, administration, and maintenance (PLOAM) messaging. and control channel) settings. Specifically, in order to activate a newly connected ONU under this protocol, the OLT discovers the serial number of the newly connected ONU (discover). The OLT does this by sending an ONU serial number request message to all of the downstream ONUs. The newly connected ONU responds to the OLT message and reports its serial number to the OLT.

  After discovering the serial number of the newly connected ONU, the OLT assigns an ONU-ID to that ONU, measures the arrival phase (arrival phase) of upstream transmission from that ONU, and equalizes delay to that ONU. ) (Adjusted with the delay value for which the ONU is notified of upstream transmission), and the OMCC is set in each ONU using the “Configure Port-ID” PLOAM message. ITU-T G. Without modification, the 984.3 protocol cannot enable the use of multiple downstream WDM wavelengths, the association of downstream wavelengths to a portion of an ONU, and the association of an OLT receiver to a portion of an ONU. Unmodified protocols cannot be used with HGPON to route downstream traffic to the appropriate ONUs or to allocate upstream bandwidth between the ONUs. As described above, in HGPON that transmits at a plurality of upstream wavelengths, a different message method is required to install and activate the ONU.

  In some embodiments, in order to efficiently install and activate an ONU in an HPON that transmits at multiple upstream wavelengths, the OLT associates the transmitted wavelength with the ONU (s) that receive traffic at that wavelength. Associate the OLT receiver with the (one or more) ONUs that send traffic to that receiver. In some embodiments, a set of ONUs that receive downstream wavelength traffic from an OLT transmitter need not all transmit upstream traffic at a single wavelength to a single OLT receiver. Thus, some of these ONUs send upstream traffic of one wavelength to one OLT receiver to one OLT receiver, and others send upstream traffic of other wavelengths to other OLT receivers. To do.

  In general, such assignments between OLT transmitters, ONUs, and OLT receivers are initially established using either a sequential reachability auto-discovery scheme or a simultaneous reachability auto-discovery scheme. Is done. A sequential auto-discovery scheme generally refers to the OLT automatically discovering one or more ONUs that share one downstream wavelength, sequentially each downstream WDM wavelength. In some embodiments, discovery is performed on one downstream wavelength at a time. A simultaneous auto-discovery scheme generally refers to the OLT automatically discovering one or more ONUs sharing each downstream wavelength in parallel with all downstream WDM wavelengths. In either case, in the case of HGPON, in some embodiments, ITU-T G. Only minor changes are made to the 984.3 protocol and / or components in the existing network, resulting in an efficient solution. Each of these automatic discovery methods will be described in more detail.

  FIG. 4 is a diagram illustrating an automatic reachability discovery scheme in the HPON logical topology 700 according to an embodiment of the present invention. Topology 700 includes OLT 710 and ONU 720. In some embodiments, OLT 710 and ONU 720 are similar to OLT 612 and ONU 650, respectively, and will not be described here. For each ONUijk, “i” corresponds to the downstream wavelength received by the ONU, “j” corresponds to the upstream wavelength received by the ONU, and “k” is the ONU in the set of ONUs that share the downstream wavelength. Corresponds to the ONU number.

  As can be seen, in the downstream direction, the wavelength transmitted by the OLT 710 (λ1−λM) is shared by the group of ONUs 720. For example, each ONUijk whose “i” is “a” shares the downstream wavelength λ1, each ONUijk whose “i” is “b” shares the downstream wavelength λ2, and “i” is “M”. Each ONUijk shares a downstream wavelength λM. In the upstream direction, the set of ONUs 720 transmits upstream traffic at a certain wavelength (λ1-λM). For example, each ONUijk whose “j” is “a” shares the upstream wavelength λ1, each ONUijk whose “j” is “b” shares the upstream wavelength λ2, and “j” is “N”. Each ONUijk shares an upstream wavelength λN.

  Although a part of the downstream wavelength and a part of the upstream wavelength are exemplified by the same code (for example, λ1 in the downstream direction and the upstream direction), they may be the same wavelength or different wavelengths. Also, the number of downstream wavelengths “M” may be the same as or different from the number of upstream wavelengths “N”. Furthermore, the set of ONUs 720 sharing the downstream and upstream wavelengths shown in FIG. 4 is exemplary. In another embodiment, 0, 1, or a combination of two or more ONUs 720 in each set of ONUs 720 that receive downstream traffic of the same wavelength is at any suitable wavelength (eg, λ1, λ2, or λN). Can send upstream traffic. For example, in some embodiments, all ONUs beginning with “720a” transmit upstream traffic of the same wavelength (eg, λN). Alternatively, only some of the ONUs starting with “720a” transmit upstream traffic of the same wavelength (as illustrated). Alternatively, each ONU starting with “720a” may transmit upstream traffic of a different wavelength.

  The method of FIG. 4 is an example of sequential automatic discovery. Each group of ONUs 720 sharing a wavelength performs discovery for one downstream wavelength at a time, and thus is sequentially discovered. In some embodiments, each downstream wavelength corresponds to a transmitter interface. In some embodiments, performing discovery from one transmitter interface at a time requires synchronization between OLT transmitters and thus requires a slight modification to the OLT to control transmitter synchronization. However, in some embodiments, using a sequential reachability auto-discovery scheme, ITU-TG No modification of the 984.3 message format is required.

  In operation, to perform discovery, the OLT 710 sends a downstream setup message 712 (eg, an ONU serial number request message such as an “SN-RQ-All” message with alloc-ID = 254) to a first wavelength (eg, , Λ1) to the first set of ONUs 720 (eg, ONUs 720a). In some embodiments, message 712 is a G. This is the same as the serial number request message used in the 984.3 protocol. To avoid collisions due to simultaneous responses from the ONU 720 in the upstream direction, in some embodiments, the OLT 710 may allow alloc-ID = 255, ie (or) upstream transmission at other downstream WDM wavelengths (eg, ZeroPointers). Send a configuration message with no bandwidth allocation for. In response to this request, the ONU 720 that receives traffic of the first wavelength (eg, an ONU that begins with “720a”) reports the serial number to the OLT 710 in a setup message 7141-714n (eg, an “SN-ONU” message). To do. These setting messages 714 are received by the receiver of the OLT 710. In some embodiments, message 714 is a G. This is the same as the serial number response message used in the 984.3 protocol. In some embodiments, the OLT 710 assigns an ONU-ID to each reported ONU 720. The ONU-ID is used as an ONU identifier in control and management messaging. OLT 710 may tag the configuration message of each responding ONU in any appropriate manner with the receiver that received the response of that ONU.

  Using serial number discovery, the OLT 710 sends each ONU in the first set of ONUs starting with “720a” to the first downstream wavelength λ1 (or OLT transmitter transmitting on λ1), and the ONU's The setup message 714 is associated with the upstream wavelength (or the OLT receiver that receives the ONU setup message 714) to be transmitted. Thus, OLT 710 associates ONU 720aa1 with downstream λ1 and upstream λ1, associates ONU 720aa2 with downstream λ1 and upstream λ1, associates ONU 720ab3 with downstream λ1 and upstream λ2, and downstream ONU 720aNn. Correlate with the stream λ1 and the upstream λN.

  In some embodiments, each downstream wavelength corresponds to one transmitter interface and each upstream wavelength corresponds to one receiver interface, so the OLT 710 transmits a first set of ONUs starting with “720a” at λ1. Each of these ONUs may be associated with a receiver interface that receives traffic from that ONU. In such an embodiment, the OLT 710 configures and maintains a reachability table that associates ONU-IDs, transmitter interface numbers (TXIF #), and receiver interface numbers (RXIF #). An example of the reachability table will be described with reference to FIG.

  When the OLT 710 completes the discovery of the serial number associated with the first downstream wavelength, it starts the discovery of the serial number associated with the second downstream wavelength. Although not shown, the OLT 710 sends a downstream setting message 712 (for example, an ONU serial number request message such as an “SN-RQ-All” message with alloc-ID = 254) to the second wavelength (for example, λ2). Discovery starts by sending to a second set of ONUs 720 (eg, starting with ONU 720b). In some embodiments, message 712 is a G. This is the same as the serial number request message used in the 984.3 protocol. To avoid collisions due to simultaneous responses from the ONU 720 in the upstream direction, in some embodiments, the OLT 710 may allow alloc-ID = 255, ie (or) upstream transmission at other downstream WDM wavelengths (eg, ZeroPointers). Send a configuration message with no bandwidth allocation for. In response to this request, an ONU 720 that receives traffic of the second wavelength (eg, an ONU that begins with “720b”) responds to this request with an appropriate configuration message 7141-714n (eg, “SN-ONU”). Message) reports the serial number to the OLT 710. These setting messages 714 are received by the receiver of the OLT 710. In some embodiments, message 714 is a G. This is the same as the serial number response message used in the 984.3 protocol. In some embodiments, the OLT 710 assigns an ONU-ID to each reported ONU 720.

  Through serial number discovery, the OLT 710 associates each ONU in the second set of ONUs starting with “720b” with the second downstream wavelength λ2 and the upstream wavelength to which the ONU configuration message 714b is transmitted. . Thus, OLT 710 associates ONU 720ba1 with downstream λ2 and upstream λ1, associates ONU 720bb2 with downstream λ2 and upstream λ2, associates ONU 720bN3 with downstream λ2 and upstream λN, and downstream ONU 720bNn. Correlate with λ2 of the stream and λN of the upstream.

  In some embodiments, each downstream wavelength corresponds to one transmitter interface, and each upstream wavelength corresponds to one receiver interface, so the OLT 710 transmits a second set of ONUs starting at “720b” at λ2. Each of these ONUs may be associated with a receiver interface that receives traffic from that ONU. In such an embodiment, the OLT 710 associates the ONU-IDs of these ONUs with the corresponding TXIF # and RXIF # in the reachability table.

  The serial number discovery is sequentially executed for each wavelength transmitted in the OLT 710. Using the sequential automatic discovery scheme described, the OLT 710 associates each ONU 720 with a downstream wavelength and an upstream wavelength in the reachability table. Thus, the ONU 720 is automatically installed and activated in the HPON. In addition, in some embodiments, the ITU-T G984.3 message format does not need to be modified, so the sequential automatic discovery scheme is an efficient solution.

  While specific embodiments have been described with reference to enhancements from GPON and messaging protocols, other embodiments are similar architectures such as BPON and GEPON systems, or HPON systems with similar architectures and messaging protocols, etc. It should be noted that it may relate to enhancements from other PSPON systems with messaging protocols. The sequential auto-discovery scheme described above may be performed whenever the ONU is first installed, when the network recovers, periodically (eg after a certain period of time) and / or manually by the network operator. .

  FIG. 5 is a diagram illustrating an example of a reachability table 800 related to the reachability automatic discovery method of FIG. The reachability table 800 is maintained and / or accessed, for example, by the OLT in the HPON in order to properly route downstream and upstream traffic. Column 810 contains the transmitter interface number (TXIF #) of the transmitter interface of the OLT. In the illustrated embodiment, it was assumed that each transmitter interface in the OLT is associated with only one wavelength. In another embodiment, downstream wavelengths transmitted to the set of ONUs are identified in other suitable ways. In some embodiments, the entries in column 810 may be entered manually by the operator. In another embodiment, the entries in column 810 are automatically discovered.

  Column 820 includes the receiver interface number (RXIF #) of the receiver of the OLT that has received the setting message from the ONU. Column 820 identifies for each OLT transmitter the set of OLT receivers that have received a configuration message from an ONU that receives downstream traffic from the OLT transmitter. In the illustrated embodiment, each OLT transmitter may be associated with all OLT receivers. However, in other embodiments, each OLT transmitter may be associated with any suitable number of OLT receivers, including one or more (but not all) OLT receivers. Also, the OLT transmitter may be associated with an OLT receiver other than that shown. In some embodiments, column 820 may be entered after receiving the configuration response message and tagging with the RXIF # of the received receiver. In some embodiments, the OLT transmitter and receiver may be synchronized.

  Column 830 contains the ONU serial number of the ONU in the HPON. As will be described in more detail later, for each transmitter interface, table 800 shows in the row 870 associated with the transmitter interface the ONU serial number corresponding to the ONU that transmits traffic at the wavelength at which the transmitter interface is located. Includes set. The set of ONU serial numbers includes a serial number for each transmitter interface. In the table 800, each ONU serial number is further associated with the above RXIF # (ONU-ID, OMCC port ID, and specific port ID service) that receives the configuration message from the ONU. In some embodiments, the entries in column 830 are discovered using the automatic discovery scheme of FIG. 4 (above) or FIG. 6 (below).

  Column 840 contains the ONU-ID number of the ONU in the HPON. As described above, the OLT assigns the ONU-ID number to the ONU that responds with the serial number in any suitable manner. In this way, the OLT associates, for example, the ONU-ID number with the ONU serial number during discovery. For each transmitter interface, table 800 includes a set of ONU-IDs corresponding to ONUs that transmit traffic at a wavelength at a transmitter interface in a row 870 associated with the transmitter interface.

  Column 850 contains the OMCC port ID number of the ONU in the HPON. As described above, OMCC refers to the ONU management control channel. In the illustrated embodiment, one such channel is set for each ONU, and control and management messaging between the OLT and the ONU takes place through that channel. This channel is identified using this OMCC port ID. Column 860 contains the port ID service for the port ID. In some embodiments, the service corresponds to a port ID. By way of example, these services include Voice over Internet Protocol (VOIP), Internet Protocol Television (IPTV), and / or high speed Internet access.

  Thus, each row 870 corresponds to one OLT transmitter interface number and associates an OLT receiver interface number, ONU serial number, ONU-ID number, OMCC port ID number, and port ID service with the transmitter interface number. By associating the ONU with the wavelength transmitted by the OLT and the OLT receiver, the table 700 can be used to correctly route downstream and / or upstream traffic.

  Modifications, additions, or deletions may be made to the exemplary systems and methods described above without departing from the scope of the present invention. The components of the exemplary methods and systems described above may be integrated or separated according to specific needs. Further, the number of components that perform the operations of the above illustrated methods and systems may be greater or lesser and may be performed by other components.

  FIG. 6 is a diagram illustrating another scheme for automatic reachability discovery in HPON logical topology 900 according to one embodiment of the invention. Topology 900 includes OLT 910 and ONU 920. In some embodiments, OLT 910 and ONU 920 are similar to OLT 612 and ONU 650, respectively, and will not be described here. For each ONUijk, “i” corresponds to the downstream wavelength received by the ONU, “j” corresponds to the upstream wavelength transmitted by the ONU, and “k” corresponds to the ONU number.

  As can be seen, in the downstream direction, the wavelength transmitted by the OLT 910 (λ1-λM) is shared by the group of ONUs 920. For example, each ONUijk whose “i” is “a” shares the downstream wavelength λ1, each ONUijk whose “i” is “b” shares the downstream wavelength λ2, and “i” is “M”. Each ONUijk shares a downstream wavelength λM. In the upstream direction, the set of ONUs 720 transmits upstream traffic at a certain wavelength (λ1-λM). For example, each ONUijk whose “j” is “a” shares the upstream wavelength λ1, each ONUijk whose “j” is “b” shares the upstream wavelength λ2, and “j” is “N”. Each ONUijk shares an upstream wavelength λN.

  Although a part of the downstream wavelength and a part of the upstream wavelength are exemplified by the same code (for example, λ1 in the downstream direction and the upstream direction), they may be the same wavelength or different wavelengths. Also, the number of downstream wavelengths “M” may be the same as or different from the number of upstream wavelengths “N”. Furthermore, the set of ONUs 920 sharing the downstream and upstream wavelengths shown in FIG. 6 is exemplary. In another embodiment, 0, 1, or 2 or more ONUs 920 (eg, 0, 1 or 2 or more in sets 920a, 920b, 920M) of each set of ONUs 920 receiving downstream traffic of the same wavelength. ONU) combination can transmit upstream traffic of any suitable wavelength (eg, λ1, λ2, or λN). For example, in some embodiments, all ONUs beginning with “920a” transmit upstream traffic of the same wavelength (eg, λN). Alternatively, only some of the ONUs starting with “920a” transmit upstream traffic of the same wavelength (as illustrated). Alternatively, each ONU starting with “920a” may transmit upstream traffic of a different wavelength.

  The method of FIG. 6 is an example of simultaneous automatic discovery. Similar to the sequential automatic discovery method, the OLT 910 associates the downstream wavelength with the ONU 920 that receives the traffic of each wavelength in the simultaneous automatic discovery method. The OLT 910 also associates each ONU 920 with an OLT receiver that receives upstream traffic from the ONU 920. However, unlike the sequential automatic discovery method, discovery of each group of ONUs 920 sharing the wavelength is performed in parallel by performing discovery of all downstream wavelengths simultaneously.

  Simultaneous discovery is advantageous in that the ONU initialization time is shortened. However, for simultaneous discovery, ITU-TG. The 984.3 protocol needs to be modified slightly. This modification includes tagging upstream and downstream physical layer overhead messages with transmitter interface numbers. By tagging in this way, the OLT receiver can properly identify the ONU 920 associated with each transmitter interface transmitting at the downstream wavelength. ITU-T G. Since some modifications to the 984.3 protocol are required, in some embodiments, such tags may require modification of OLT and / or ONU firmware and software.

  In some embodiments, during discovery, the physical layer overhead message is tagged with a transmitter interface number. For example, a downstream setting message 912 (for example, a discovery message such as a serial number request transmitted simultaneously by an OLT transmitter interface) may be tagged by the OLT 910 with a transmitter interface number (TXIF #). In this way, the setting messages 912a-912M are tagged with TXIF # 1-M, respectively.

  The ONU 920 responds by notifying the OLT 910 with the serial number in the upstream setting message 914, and in some embodiments including the received TXIF # in the upstream setting message 914, to explicitly add the TXIF #, the OLT serial number A new PLOAM messaging structure can also be defined for requests and ONU serial number responses. In another embodiment, existing fields in the OLT serial number request and ONU serial number response can be used for TXIF # transmission. For example, in some embodiments, TXIF # can be carried using the “IDENT” attribute field in the downstream setup message and the “IND” attribute field in the upstream setup message. In another embodiment, any suitable field can be used to carry TXIF #. In order to maintain backward compatibility, in some embodiments, these attributes may be ITU-T G. It is reconfigurable according to the 984.3 protocol.

  The receiver of the OLT 910 receives the setting message 914 from the downstream ONU 920. The OLT 910 may tag each ONU configuration message that has responded in any suitable manner with the OLT receiver that received the ONU response. In some embodiments, the OLT 910 also assigns an ONU-ID to each responding ONU 920.

  The OLT 910 transmits each ONU in the first set of ONUs starting with “920a”, a first downstream wavelength λ1 (or an OLT transmitter transmitting at λ1), and an ONU configuration message 914. Maintain a reachability table associated with the upstream wavelength (or OLT receiver that receives the ONU setup message 914). Thus, OLT 910 associates ONU 920aN1 with downstream λ1 and upstream λN, associates ONU 920aa2 with downstream λ1 and upstream λ1, associates ONU 920ab3 with downstream λ1 and upstream λ2, and downstream ONU 920aNn. Correlate with λ1 of the stream and λN of the upstream.

  The reachability table associates each ONU in the second set of ONUs beginning with “920b” with the second downstream wavelength λ2 and the upstream wavelength to which the ONU configuration message 914b is transmitted. Thus, OLT 910 associates ONU 920ba1 with downstream λ2 and upstream λ1, associates ONU 920bb2 with downstream λ2 and upstream λ2, associates ONU 920ba3 with downstream λ2 and upstream λ1, and downstream ONU 920bNn. Correlate with λ2 of the stream and λN of the upstream.

  The reachability table further associates each ONU in the Mth set of ONUs starting with “920M” with the Mth downstream wavelength λM and the upstream wavelength to which the ONU configuration message 914M is transmitted. Thus, OLT 910 associates 920Ma1 with downstream λM and upstream λ1, associates 920Mb2 with downstream λM and upstream λ2, associates 920Mb3 with downstream λM and upstream λ2, and 920MNn down Correlate with λM of the stream and λN of the upstream.

  In some embodiments, each downstream wavelength corresponds to a transmitter interface, and each upstream wavelength corresponds to a receiver interface, so the OLT 910 identifies the ONU 920 in the reachability table as a transmitter interface and a receiver interface (eg, TXIF # and RXIF #). The reachability table similar to the above table 800 or the like is maintained by the OLT 910. Thus, this reachability table will not be described in detail again.

  As described above, the tagging at the time of discovery associates the ONU Seto with TXIF # and RXIF #. However, G. Since the 984.3 protocol does not prescribe such tagging, such tagging requires modification of both OLT and ONU software (and / or firmware). For example, the OLT needs to tag the downstream setup message with TXIF #, and the ONU needs to tag with the TXIF # that received the setup response message. As explained below, the OLT is a G.G. When sending the TXIF # in the unused configuration message field that the ONU acknowledges by copying the first 9 bytes of the incoming message with the 984.3 protocol, the ONU software may still not require modification (although the OLT Software needs to be fixed). Such an embodiment may provide a more efficient simultaneous automatic discovery scheme in some cases.

  In some embodiments, ITU-T G. Even without modifying the 984.3 configuration message, the transmitter interface of the OLT 910 performs ONU serial number discovery and ranging on all ONUs 920 simultaneously. During discovery, the OLT 910 receives ONU serial numbers and assigns ONU-IDs to these serial numbers (but downstream wavelengths are not associated with the ONU 920 at this point). In some embodiments, the OLT 910 associates with each ONU 920 an OLT receiver that receives the serial number of that ONU. G. When discovery is completed according to the 984.3 protocol procedure, the OLT 910 associates the ONU 920 with the downstream wavelength. The OLT 910 performs this association by including the transmitter interface number (TXIF #) in the downstream setting message 912 transmitted after discovery. In some embodiments, each ONU 920 includes an assigned ONU-ID and a first 9-byte copy of the incoming setup message (including TXIF #) in a setup response message (eg, an acknowledge message). Upon receiving the setup response message 914 from each ONU 920, the OLT 910 associates the downstream wavelength with the ONU 920. In some embodiments, the OLT 910 associates each ONU 920 with an OLT receiver that receives the ONU's configuration response message 914 (eg, the OLT 910 associates when this association has not yet occurred).

  As an example, in some embodiments, the OLT 910 tags a “Configure Port-ID” PLOAM message with TXIF # that is used to configure the OMCC after discovery. TXIF # occupies, for example, unused bits of the “Configure Port-ID” message (defined in the ITU-T G.984.3 protocol). Upon receipt of the corresponding “Configure Port-ID” message, each ONU 920 includes the assigned ONU-ID and the first 9-byte copy of the incoming “Configure Port-ID” message in the acknowledge message. When the OLT 910 receives an acknowledgment message from the ONU 920, the OLT 910 associates the downstream wavelength (corresponding to the TXIF # received and reflected by the ONU 920) with the ONU 920. The OLT 910 associates the ONU 920 (eg, if not already) with the corresponding OLT receiver.

  Upon receiving the upstream setup message 914 from all ONUs 920, the OLT 910 receives the downstream wavelength that received the ONU 920 (eg, via TXIF #), and the OLT receiver that receives traffic from the ONU 920 (eg, via RXIF #). Associate. Thus, for example, the ONU 920 is associated with the downstream wavelength λ1 and the corresponding OLT receiver in the reachability table, and the ONU 920b is associated with the downstream wavelength λ2 and the corresponding OLT receiver in the reachability table, The ONU 920M is associated with the downstream wavelength λM and the corresponding OLT receiver in the reachability table.

  The reachability table similar to the above table 800 or the like is maintained by the OLT 910. Thus, this reachability table will not be described in detail again. It should be noted that, depending on the embodiment, the unused bits in the “Configure Port-ID” and the ONU acknowledge message are used for improving the function, so that backward compatibility with GPON can be ensured. In some embodiments, the physical layer overhead configuration (for example, “IDENT” and “IND”) is not changed, and the firmware and software functions of the ONU 920 need not be improved.

  Furthermore, it should be noted that which field of which setup message may be used to carry a wavelength identifier (eg, TXIF #). Also, any suitable identifier (eg, TXIF #) for the downstream WDM wavelength can be used. Also, any suitable identifier (eg, ONU serial number or ONU-ID) of the ONU can be used. While specific embodiments have been described with reference to enhancements from GPON and messaging protocols, other embodiments provide functionality from other PSPON systems with similar architectures and messaging protocols, such as BPON and GEPON systems. It should be further noted that it may be related to improvement.

  Modifications, additions, or deletions may be made to the exemplary systems and methods described above without departing from the scope of the present invention. The components of the exemplary methods and systems described above may be integrated or separated according to specific needs. Further, the number of components that perform the operations of the above illustrated methods and systems may be greater or lesser and may be performed by other components.

  FIG. 7 is a diagram illustrating an OLT 1010 in one example of an HPON logical topology 1000 according to one embodiment of the invention. Topology 1000 includes OLT 1010 and ONU 1020. In some embodiments, OLT 1010 and ONU 1020 are similar to OLT 612 and ONU 650, respectively, and will not be described here. As will be described further below, the HPON logical topology 1000 allows for efficient upgrades to HPONs that transmit at multiple upstream wavelengths. The functional enhancement due to topology 1000 is due to the efficient association of ONU 1020 with OLT transmitter 1021 and OLT receiver 1025 in reachability table 1012 of OLT 1010. In some embodiments, as described further below, topology 1000 can reach downstream traffic (via corresponding transmitter 1021) to the correct ONU 1020 and reach to build a suitable upstream bandwidth allocation map. A possibility table 1012 (and switch 1016) can be used.

  In topology 1000, OLT 1010 includes a reachability table 1012, a dynamic bandwidth allocation (DBA) engine 1014, a switch 1016, a transmitter 1021, a receiver 1025, and a system port 1026. In some embodiments, transmitter 1021 and receiver 1025 are the same as transmitter 514 and receiver 619, respectively, described above with reference to FIG. Therefore, the transmitter 1021 and the receiver 1025 will not be described in detail again. The transmitter interface of the transmitter 1021 interfaces between the transmitter 1021 and the ONU 1020. These transmitter interfaces may be synchronized to communicate discovery and / or control messages to the ONU 1020. The receiver interface of the receiver 1025 is an interface between the ONU 1020 and the receiver 1025. In some embodiments, the transmitter interface and receiver interface of the OLT 1010 may be synchronized. The system port 1026 forwards downstream network traffic to the switch 1016 and receives upstream traffic from the switch 1016 over the network.

  The reachability table 1012 includes any suitable reachability table, such as a table similar to the table 800 described above with reference to FIG. The reachability table 1012 may be needed for enhancements to HPONs transmitting at multiple upstream wavelengths, so the OLT transmitter interface (ie, downstream WDM wavelength) and OLT receiver interface (ie, upstream WDM). Wavelength) is associated with the ONU (eg, using the ONU-ID). The reachability table 1012 is constructed and maintained in any suitable manner, for example in the OLT 1010, as described above with reference to FIGS.

  The DBA engine 1014 is any suitable component that generates a bandwidth allocation map that is used to allocate time slots to the ONU 1020 for upstream transmission. The DBA engine 1014 also forwards this map to the corresponding transmitter 1021. In some embodiments, the DBA engine 1014 includes a DBA engine for each OLT receiver. In some embodiments, each DBA engine receives bandwidth requests / reports from the corresponding ONT 1020 downstream of the OLT receiver. In some embodiments, each DBA engine is independent of other DBA engines and uses an algorithm (which may be different from the algorithm used by other DBA engines) to allocate bandwidth. In some embodiments, the bandwidth allocation map from the DBA engine is combined to forward the combined bandwidth allocation map to each OLT transmitter 1021 for transmission to the ONU 1020. In some embodiments, the bandwidth allocation map from the DBA engine is sent so that each OLT transmitter 1021 transmits only the bandwidth allocation map corresponding to that transmitter's downstream ONU 1020 (eg, using the association in table 1012). And may be configured. However, in another embodiment, the DBA engine 1014 receives bandwidth requests / reports from all ONUs 1020, uses a bandwidth allocation algorithm, and forwards the determined bandwidth allocation map to all OLT transmitters 1021. Or a bandwidth allocation map (corresponding to OLT transmitter downstream ONU 1020 and generated using table 1012) is forwarded to each OLT transmitter 1021. The physical layer overhead configuration includes a configuration message and a bandwidth allocation map.

  It should be noted that the reachability table 1012 can also be used for fault localization in some embodiments. For example, in some embodiments, an ONU 1020 (eg, all ONUs beginning with “1020a”) may send downstream signal failure indications to the OLT 1010. The OLT 1010 uses the reachability table 1012 to determine, for example, that signal failure indications are all transmitted from ONUs beginning with “1020a” connected to the OLT transmitter 1021a. Using the reachability table 1012, the OLT 1010 can determine that a potential failure location is a connection between an RN multiplexer and an ONU starting with “1020a”.

  Switch 1016 is any suitable component that routes incoming network traffic in the downstream direction to the correct OLT transmitter 1021. The switch 1016 routes downstream traffic to the correct OLT transmitter 1021 based on the traffic identifier (eg, VLAN address or Ethernet MAC address) and the ONU-ID and TXIF association in the reachability table 1012. To do. For example, after receiving downstream traffic from the system port 1026, the switch 1016 uses the associated traffic identifier to determine the ONU 1020 to send the traffic. Based on the reachability table 1012, the switch 1016 forwards traffic to the OLT transmitter 1021 corresponding to the ONU 1020. In some embodiments, in the upstream direction, switch 1016 combines the traffic from each OLT receiver 1025 and forwards it to system port 1026 for transmission over the network. Optionally, when using multiple ports of an Ethernet switch, the upstream burst is switched to the corresponding system port (not shown) based on the ONU-ID.

  During operation of the HPON 1000, the reachability table 1012 is constructed and maintained during the initialization phase, as described above with reference to FIGS. System port 1026 receives incoming network traffic in the downstream direction and forwards the traffic to switch 1016. Switch 1016 is routed to the correct transmitter 1021 based on the associated traffic identifier and reachability table 1012. For example, after receiving downstream traffic from the system port 1026, the switch 1016 uses the associated traffic identifier to determine the ONU 1020 to send the traffic. Based on the reachability table 1012, the switch 1016 forwards traffic to the OLT transmitter 1021 corresponding to the ONU 1020. Traffic is communicated to the correct ONU 1020.

  In the upstream direction, the ONU 1020 transmits traffic of the corresponding wavelengths λ1-λN according to the bandwidth allocation map generated by the DBA engine 914 (including one or more DBA engines). Depending on the embodiment, these maps may be generated using the table 1012, or may be generated without using the table 1012 in another embodiment. The upstream burst received by the receiver 1025 is transmitted to the switch 1016. In some embodiments, switch 1016 forwards these upstream bursts to the network via system port 1026. In some embodiments, the switch 1016 forwards these upstream bursts to the network via a corresponding system port (not shown).

  Modifications, additions, or deletions may be made to the exemplary systems and methods described above without departing from the scope of the present invention. The components of the exemplary methods and systems described above may be integrated or separated according to specific needs. Further, the number of components that perform the operations of the above illustrated methods and systems may be greater or lesser and may be performed by other components.

  Although the invention has been described with reference to several embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made. The present invention includes such changes and modifications as fall within the scope of the appended claims.

In addition to the above-described embodiment, the following notes are included.
(Appendix 1) A communication management method in a hybrid passive optical network (HPON),
Transmitting a first configuration message to the HPON at a first wavelength;
A receiver of an optical line terminal (OLT) receiving a configuration response message from an ONU of a first set of optical network units (ONUs);
Based on the configuration response message from the first set of ONUs, in a database, each ONU of the first set of ONUs with the receiver that receives the configuration response message from the first wavelength and the ONU. The associating stage,
After transmitting the first configuration message, transmitting a second configuration message to the HPON at a second wavelength;
The plurality of receivers of the OLT receiving configuration response messages from ONUs not belonging to the first set of ONUs of a second set of ONUs;
Based on the configuration response message from the second set of ONUs, the receiver that receives in the database each ONU of the second set of ONUs from the second wavelength and the configuration response message from the ONU. And associating with the method.
(Supplementary note 2) Furthermore, each receiver receives a bandwidth request from a downstream ONU of the receiver;
Forwarding the bandwidth request received by the receiver to a dynamic bandwidth allocation (DBA) engine;
The method of claim 1, wherein the DBA engine applies a bandwidth allocation algorithm to the bandwidth request.
(Supplementary Note 3) The bandwidth request received by each receiver is forwarded to the DBA engine associated with that receiver,
The method according to appendix 2, wherein a bandwidth allocation algorithm of one DBA engine is different from a bandwidth allocation algorithm of another DBA engine.
(Supplementary note 4) The method according to supplementary note 2, wherein a bandwidth request received by the receiver is forwarded to one DBA engine.
(Supplementary note 5) The method according to supplementary note 2, further comprising the step of generating a bandwidth allocation map used to allocate time slots for upstream transmission to the ONU.
(Supplementary note 6) The method according to supplementary note 5, further comprising: transmitting the same bandwidth allocation map to the first set of ONUs and the second set of ONUs.
(Supplementary note 7) A plurality of bandwidth allocation maps are generated using the database, and the first bandwidth allocation map is set to the first ONU set, and the second bandwidth allocation map is set to the second ONU. The method of claim 5, comprising transmitting to the set.
(Supplementary Note 8) An optical line terminal (OLT) that performs communication management in a hybrid passive optical network (HPON),
A first transmitter interface for transmitting a first configuration message to the HPON and a plurality of receivers of the OLT;
Receiving a configuration response message from the optical network unit (ONU) of the first set of ONUs;
Based on the configuration response message from the first set of ONUs, in a database, each ONU of the first set of ONUs with the receiver that receives the configuration response message from the first wavelength and the ONU. An associated receiver;
A second transmitter interface that transmits a second configuration message to the HPON after the first transmitter interface transmits the first configuration message;
The plurality of receivers are:
Receiving a setting response message from an ONU that does not belong to the first ONU set of the second ONU set;
Based on the configuration response message from the second set of ONUs, in the database, each ONU of the second set of ONUs receives the configuration response message from the second transmitter interface and the ONU. An optical line terminal associated with a receiver.
(Supplementary Note 9) Each of the plurality of receivers of the OLT further includes:
Receiving a bandwidth request from the downstream ONU of the receiver;
Forward the received bandwidth request to a dynamic bandwidth allocation (DBA) engine;
The OLT according to appendix 8, further comprising a DBA engine that applies an algorithm for allocating bandwidth to received bandwidth requests.
(Supplementary Note 10) The bandwidth request received by each receiver is forwarded to the DBA engine associated with that receiver,
The OLT according to appendix 9, wherein a bandwidth allocation algorithm of one DBA engine is different from a bandwidth allocation algorithm of another DBA engine.
(Supplementary note 11) The OLT according to supplementary note 9, wherein a bandwidth request received by the receiver is transferred to one DBA engine.
(Supplementary note 12) The OLT according to supplementary note 9, wherein the DBA engine further generates a bandwidth allocation map used to allocate time slots to the ONU for upstream transmission.
(Supplementary note 13) The OLT according to supplementary note 12, wherein the transmitter interface further transmits the same bandwidth allocation map to the first set of ONUs and the second set of ONUs.
(Supplementary Note 14) The DBA engine further generates a plurality of bandwidth allocation maps using the database,
The first transmitter interface further transmits a first bandwidth allocation map to the first set of ONUs;
The OLT of appendix 12, wherein the second transmitter interface further transmits a second bandwidth allocation map to the second set of ONUs.
(Supplementary Note 15) A communication management method in a hybrid passive optical network (HPON),
Transmitting a first setup message including a first transmitter interface number to the HPON at a first wavelength;
Transmitting a second setup message including a second transmitter interface number to the HPON at a second wavelength substantially simultaneously with the first setup message;
A receiver of an optical line terminal (OLT) receiving a setup response message from an ONU of a first set of optical network units (ONUs) each including the first transmitter interface number;
A receiver of an optical line terminal (OLT) receiving a setup response message from an ONU of a second set of optical network units (ONUs) each including the second transmitter interface number;
Based on the configuration response message from the first set and second set of ONUs:
In the database, associating each ONU in the first set of ONUs with the first wavelength and a receiver that receives the configuration response message from the ONU;
In the database, associating each ONU in the second set of ONUs with the second wavelength and a receiver that receives the configuration response message from the ONU.
(Supplementary Note 16)
Each receiver receiving a bandwidth request from a downstream ONU of the receiver;
Forwarding the bandwidth request received by a receiver to a dynamic bandwidth allocation engine;
The method of claim 15, wherein the DBA engine applies a bandwidth allocation algorithm to the bandwidth request.
(Supplementary Note 17) The bandwidth request received by each receiver is forwarded to the DBA engine associated with that receiver,
The method of claim 16, wherein the bandwidth allocation algorithm of one DBA engine is different from the bandwidth allocation algorithm of other DBA engines.
(Supplementary note 18) The method according to supplementary note 16, wherein the bandwidth request received by the receiver is forwarded to one DBA engine.
(Supplementary note 19) The method according to supplementary note 16, further comprising generating a bandwidth allocation map used to allocate time slots for upstream transmission to the ONU.
(Supplementary note 20) The method according to supplementary note 19, further comprising transmitting the same bandwidth allocation map to the first set of ONUs and the second set of ONUs.
(Supplementary note 21) A plurality of bandwidth allocation maps are generated using the database, and the first bandwidth allocation map is set to the first ONU set, and the second bandwidth allocation map is set to the second ONU. The method of claim 19, comprising the step of transmitting to the set.
(Supplementary Note 22) An optical line terminal (OLT) that performs communication management in a hybrid passive optical network (HPON),
Sending a first configuration message including a first transmitter interface number to the HPON;
Sending a second setup message containing a second transmitter interface number to the HPON substantially simultaneously with the first message;
A plurality of receivers of the OLT,
Receiving a setup response message including the first transmitter interface number from an optical network unit (ONU) of the first set of ONUs;
Receiving a setup response message including the second transmitter interface number from an optical network unit (ONU) of the second set of ONUs;
Based on the configuration response message from the first set and second set of ONUs:
In the database, associating each ONU in the first set of ONUs with the first wavelength and a receiver that receives the configuration response message from the ONU;
In the database, an optical line terminal associating each ONU in the second set of ONUs with the second wavelength and a receiver that receives the configuration response message from the ONU.
(Supplementary Note 23) Each of the plurality of receivers of the OLT further includes:
Receiving a bandwidth request from the downstream ONU of the receiver;
Forward the received bandwidth request to a dynamic bandwidth allocation (DBA) engine;
The OLT of appendix 22, wherein the OLT further comprises a DBA engine that applies an algorithm that allocates bandwidth to received bandwidth requests.
(Supplementary Note 24) The bandwidth request received by each receiver is forwarded to the DBA engine associated with that receiver,
The OLT according to appendix 23, wherein a bandwidth allocation algorithm of one DBA engine is different from a bandwidth allocation algorithm of another DBA engine.
(Supplementary note 25) The OLT according to supplementary note 23, wherein a bandwidth request received by the receiver is forwarded to one DBA engine.
(Supplementary note 26) The OLT according to supplementary note 23, wherein the DBA engine further generates a bandwidth allocation map used to allocate time slots to the ONU for upstream transmission.
(Supplementary note 27) The OLT according to supplementary note 26, wherein the transmitter interface further transmits the same bandwidth allocation map to the first set of ONUs and the second set of ONUs.
(Supplementary note 28) The DBA engine further generates a plurality of bandwidth allocation maps using the database,
The first transmitter interface further transmits a first bandwidth allocation map to the first set of ONUs;
27. The OLT of clause 26, wherein the second transmitter interface further transmits a second bandwidth allocation map to the second set of ONUs.
(Supplementary note 29) Reachability table in a hybrid passive optical network (HPON),
An entry identifying an ONU in a first set of ONUs in the HPON, wherein the entry identifying the ONU in the first set of ONUs is a first downstream wavelength and a plurality of upstreams in the table Associated with one of the wavelengths,
An entry identifying an ONU in a second set of ONUs in the HPON, wherein the entry identifying the ONU in the second set of ONUs is a second downstream wavelength and a plurality of upstreams in the table A reachability table associated with one of the wavelengths.
(Supplementary Note 30) Each entry that identifies an ONU in the first set of ONUs is associated with an entry in the table that identifies a first transmitter interface transmitting at the first wavelength in the table. Is associated with the first downstream wavelength,
Each entry that identifies an ONU in the second set of ONUs is associated with an entry in the table that identifies a second transmitter interface transmitting at the second wavelength in the table, thereby providing a second Associated with a downstream wavelength of
Item 29. Each entry identifying an ONU is associated with an upstream wavelength of a plurality of upstream wavelengths by associating with an entry in the table identifying a receiver interface that receives the upstream wavelength. Reachability table.
(Supplementary note 31) The table is used to generate a first bandwidth allocation map for a first set of ONUs and a second bandwidth allocation map for a second set of ONUs. The reachability table according to attachment 29.

It is a figure which shows an example of ESPON. It is a figure which shows an example of HPON. It is a figure which shows an example of HPON which transmits a some upstream wavelength. FIG. 3 illustrates an automatic reachability discovery scheme in an HPON logical topology according to an embodiment of the present invention. FIG. 5 is a diagram illustrating an example of a reachability table related to the reachability automatic discovery method of FIG. 4. FIG. 6 illustrates another automatic discovery scheme for reachability in an HPON logical topology according to one embodiment of the present invention. FIG. 4 is a diagram illustrating an OLT in an example of an HPON logical topology according to an embodiment of the present invention.

Claims (5)

A communication management method in a hybrid passive optical network (HPON),
Transmitting a first configuration message to the HPON at a first wavelength;
A receiver of an optical line terminal (OLT) receiving a configuration response message from an ONU of a first set of optical network units (ONUs);
Based on the configuration response message from the first set of ONUs, in a database, each ONU of the first set of ONUs with the receiver that receives the configuration response message from the first wavelength and the ONU. The associating stage,
After transmitting the first configuration message, transmitting a second configuration message to the HPON at a second wavelength;
The plurality of receivers of the OLT receiving configuration response messages from ONUs not belonging to the first set of ONUs of a second set of ONUs;
Based on the configuration response message from the second set of ONUs, the receiver that receives in the database each ONU of the second set of ONUs from the second wavelength and the configuration response message from the ONU. And associating with the method. An optical line terminal (OLT) for managing communication in a hybrid passive optical network (HPON),
A first transmitter interface for transmitting a first configuration message to the HPON and a plurality of receivers of the OLT;
Receiving a configuration response message from the optical network unit (ONU) of the first set of ONUs;
Based on the configuration response message from the first set of ONUs, in a database, each ONU of the first set of ONUs with the receiver that receives the configuration response message from the first wavelength and the ONU. An associated receiver;
A second transmitter interface that transmits a second configuration message to the HPON after the first transmitter interface transmits the first configuration message;
The plurality of receivers are:
Receiving a setting response message from an ONU that does not belong to the first ONU set of the second ONU set;
Based on the configuration response message from the second set of ONUs, in the database, each ONU of the second set of ONUs receives the configuration response message from the second transmitter interface and the ONU. An optical line terminal associated with a receiver. A communication management method in a hybrid passive optical network (HPON),
Transmitting a first setup message including a first transmitter interface number to the HPON at a first wavelength;
Transmitting a second setup message including a second transmitter interface number to the HPON at a second wavelength substantially simultaneously with the first setup message;
A receiver of an optical line terminal (OLT) receiving a setup response message from an ONU of a first set of optical network units (ONUs) each including the first transmitter interface number;
A receiver of an optical line terminal (OLT) receiving a setup response message from an ONU of a second set of optical network units (ONUs) each including the second transmitter interface number;
Based on the configuration response message from the first set and second set of ONUs:
In the database, associating each ONU in the first set of ONUs with the first wavelength and a receiver that receives the configuration response message from the ONU;
In the database, associating each ONU in the second set of ONUs with the second wavelength and a receiver that receives the configuration response message from the ONU. An optical line terminal (OLT) for managing communication in a hybrid passive optical network (HPON),
Sending a first configuration message including a first transmitter interface number to the HPON;
Sending a second setup message containing a second transmitter interface number to the HPON substantially simultaneously with the first message;
A plurality of receivers of the OLT,
Receiving a setup response message including the first transmitter interface number from an optical network unit (ONU) of the first set of ONUs;
Receiving a setup response message including the second transmitter interface number from an optical network unit (ONU) of the second set of ONUs;
Based on the configuration response message from the first set and second set of ONUs:
In the database, associating each ONU in the first set of ONUs with the first wavelength and a receiver that receives the configuration response message from the ONU;
In the database, an optical line terminal associating each ONU in the second set of ONUs with the second wavelength and a receiver that receives the configuration response message from the ONU. A reachability table in a hybrid passive optical network (HPON),
An entry identifying an ONU in a first set of ONUs in the HPON, wherein the entry identifying the ONU in the first set of ONUs is a first downstream wavelength and a plurality of upstreams in the table Associated with one of the wavelengths,
An entry identifying an ONU in a second set of ONUs in the HPON, wherein the entry identifying the ONU in the second set of ONUs is a second downstream wavelength and a plurality of upstreams in the table A reachability table associated with one of the wavelengths.

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